Here's one on amazon that says it has enough components to construct a graphene sheet structure measure approx. 28x14"

http://www.amazon.co.uk/Graphene-Sheet-C3-500-Model-Kit/dp/B00HND27RQ

Couple more amazon links:

http://www.amazon.com/Molecular-Models-Piece-Carbon-Nanotube/dp/B005TKTGTC http://www.amazon.com/Molecular-Models-Piece-Carbon-Nanotube/dp/B005TKTEZI

This website has some, but doesn't give very good descriptions of the individual kits..

http://www.molecularmodelscompany.com/Products/AtomicMolecules.aspx

Another similar kit that looks close to what he's holding in the picture

http://www.indigo.com/molecular_models/minit/kits/graphene-sheet-carbon-film-model-kit-67788W.html

The website listed above also has the individual parts for sale, which look very similar to the ones in the picture

http://www.indigo.com/molecular_models/orbit/components/

Hope that helps!